Sanding machine



March 6, 1945. s, FARNER I SANDING MACHINE 2 Sheets-sheaf 1 Filed July l7, 1944 Inventor i B 2AM m a tneys March 6, 1945. s. FARNER SANDING MACHINE Filed July 17, 1944 2 Sheets-Sheet 2 Inventor Patented Mar. 6, 1945 .esannmdmonnfn I Lewis Samuel Far'ner, New Kensington, Pa. Application July 17, 194 4, Serial N0; 545,231

' My invention relates, generally, to abrading machines, and more particularly-to sanding machines for shaping and cleaning pitted and'b'urnt welding tips such as are used in spot welding.

The primary object of my invention is to provide a simply constructed, inexpensive machine for shaping and cleaning such tips quickly and easily and which is especially designed for power .drive of shaping and cleaning implements and .for maximum flexibility as regards adjustment ,into 'difierent angular positions of the shaping and cleaning implements while the same are being driven. 1 l e Other and subordinate ;objectsare-also coin- .prehe'nded by my invention, all of which, together with the precise nature of my improve,- ments, will be readily understood when the succeeding description and claims are read with reference to the drawings accompanying and form- .ing part of this specification.

In said drawings:

Figure 1. is a view in front elevation of my improved sanding bodiment, V

- Figur 2 is a viewiin endelevation," i Figure 3 is a view in-plan,- f

Figure 4 is a view in plan ofone of the sanding implements,

Figure 5 is a view in transverse section taken on the line 55 of Figure 3'and drawn-to an enlarged scale,

Figure 6 is a similarview taken on the line 6-6 of Figure 3. H I Referring to the drawings by numerals,-my improved sandingmachine, in the embodiment 5 Claims. (oi. 51 -166 pin 10 .onithe bar, I. extends, limits swinging of th -bracket 3 and motor 5 relative-to said barrl.

A Y-shaped yoke frame l0 extends laterally from'the motor 5 with rear ends [1 straddling the motor 5 and journaledl'on the oppositeendsiof the armature shaft 6 so that said framelfl is .swingable horizontally about said shaft as an axis..

machine, in its preferred emillustrated, comprises a base bar I provided with end apertures 2fforsecuringthe same, as by screws, not shown, in upright position'to a fixed support of anysuitable type. a

A u-shaped right-angled bracket 3, of barlike form, is pivotally mounted intermediate its ends, and centered on the bar I, by a shouldered bolt 4, so that said bracket is swingable v about an horizontal axis. 1

3, with its armature shaft 6 disposed upright,

Adjacentthe front end of the yoke franie lll is l a pair of upper and-lower pulleys -ll lz[fast .uponthe ends of an upright shaft-l3 vjournaled in saidframe in a manner presently described.

A belt I4 extends from a pulley lfi fast on the. 'upper'end of the armature shaft 6 and is trained around the upper pulley. I I; .whereby said motor 5 is operatively connected'to saidpair' of zpulleys ll, l2. 'Theshaft I3 is rotatably mounted in an upright bushing yokeframe-lll. 1

An extension arm .I l projects horizontallyfrom the front end of the yoke frame lflnand isswingl6 suitably fixed in .the

ably mounted on said end by a pair of rigid links 18 extending from itsrear end with a spacer. l9 therebetween, said links straddling said;..front end of the yoke frame l0 and beingjour-naled on thedes'cribed bushing" [B and fixed to said? arm by screws20. 1 A bar-like bracket 22 is mounted in upright position on a upturned front end tongue 23 on the'arm l7, and by means of a bolt 24 and wing nut 25, the arrangement being such; that said bracket 22 may be tilted on the'tongue 23. about an-horizontal axisinto difierent set posiitionsi.

A-guide rod 26 extends through right angled ends 2| of said bracket 22 and beyond onexend 2| of the bracket to forma manipulating-- hand grip '21, the purpose of" which will presently be seen.

A fiat implement-carrying arm 28 is slidably mounted at its rear end on the guiderod '26 by a bushing 29 fixed in said end of said arm and confined between the ends 2| of said brackand to,v swing with said bracket 3 and also on the same about a vertical. axis, The pivotal mounting forthe motori has the form of *a pair of bearing lugs 1 extending radially-from the motor casing and fitting in between the ends of the bracket 3, with bolts 8 extending through said lugs and saidends, of the bracket;v ;-:An

arcuateisldtlaiinithe bracket-.3, through which a -t5-v A'motor 5 is, pivotally mounted on the bracket it is prevented from turning on the guide'g rod 22' and is provided, intermediateits ends, with a.

A pai'r onopposed, axially aligned, disc-like v shaping and cleaning implementstl is provided at each'side edge of the implement-carrying arm 28 at the outerend thereof, this pair being aligned transverselyof said arm; The implements eachcomprises a circular body32 havingon the outer side face thereof an edge flange 33 0;!

part a clear understanding of my invention right-angled form in cross section and forming an internal, annular, edge groove 34 around the outer face of the body 32. The bodies 32 of each pair of implements 3| are fixed upon an axial stud 35 journaled in the arm 28, the arrangement being such that the bodies of each pair are imposed flat against opposite side faces of the arm 28; The opposed sides of the bodies "32 of each pair of implements 3| are grooved around their edges, as at 35, so that each pair of bodies 32 forms therebetween a pulley. A belt 36 is trained around the bodies 32 and around the pulley l2, whereby said pairs of implements 3t are driven by the motor 5, as will be clear. rubber, or like, material disc 31 is fitted in each groove 34, as a resilient backing for an abrasive disc 38 also fitting in each groove 34 with the following exception. Each disc 37 is provided with diametrically opposite flattened side edges 39 for engagement with pairs of transverse pins .40 extending through the flange 33 and groove 3420! the body of the implement, and whereby the abrasive disc 38 is keyed to the body 32 for rotation thereby. The discs 38 may be provided with outer abrasive faces of different typ s, for instance, coarse or fine, for use in different phases of the shaping and cleaning operation.

The motor is designed to be controlled by a suitable. foot pedal, not shown, so that the hands of an operator are left free for manipulation of the'described implements over and around the tips one of which is represented in. dotted lines As will now be seen, the entire device, with the exception. of the bar I, may be swung vertically,

onv the bolt 4,, the yoke frame H], with parts carried thereby, may be swung horizontally about :the motor 5, the extension arm l1, and the parts thereon, may be swung horizontally on the yoke frame it! independently, the bracket 22' may be' the use of the described implements 3| selectively- .on. the tips so that the shaping and cleaning of the tips may be quicklyand conveniently accom- The foregoing will, it is believed, suflice to imwithout further explanations Manifestly, the invention, as described, is susceptible of modification without departing from the inventive concept, and right is herein reserved to such modifications as fall within. the

scopeof the appended claims.

. 'WhatIcIaimis:

1. In a machine of the class. described, a motor adapted to be mounted on a base and having .an armature shaft, means to mount said motor on said base with said shaft in upright position,

a yoke frame having a rear end straddling said motor and swingably mounted on opposite ends of said shaft, opposed pairs-of disc-like abrading implements axially aligned in each pair, means to mount said pairs of elements on the outer end of said. yoke frame for rotation in unison. and adjustment bodily in unison into different angua yoke frame having a rear end straddling said motor and swingably mounted on opposite ends of said shaft, opposed pairs of disc-like abradi'ng implements axially aligned in each pair, meansto mount said pairs of elements on the outer end of said yoke frame for rotation in unison and adjustment bodily in unison into different angular positions independently of swing of said frame, and driving connections between said shaft and said implements, said means comprising an arm swingably mounted on the front end of said yoke frame, an implement-carrying arm, and means to mount said implement-carryin arm on said swingable arm for sliding adjustment laterally of said swingable arm and for tilting adjustment laterally into different positions.

3. In a machine of the class described, a motor adapted to be mounted on a base and having an armature shaft, means to mount said motor on said base with said shaft in upright position, a yoke frame having a rear end straddling said motor and swingably mounted on opposite ends of said shaft, opposed pairs of disc-Iikeahrading implements axially aligned in each pair, means to mount said pairs of elements on the outer end of said yoke frame for rotation in unison and adjustment bodily in unison into different angular positions independently of swinging of said frame, and driving connections between said shaft and said, implements, said connections comprising a driving belt, said pairs of implements. forming therebetween pulleys around which said'belt is trained.

4. In a machine of the class described, a motor adapted to-be mounted. on a base and having an armature shaft, means tomou-nt said motor on said base with said shaft in upright position,- a yoke frame having a rear end straddling said motor and swingably mounted on opposite ends of said shaft, opposed pairs of disc-like abrading implements axially aligned in each pair, means to mount said pairs of elements on the outer end of saidyoke frame for rotation in unison and adjustment bodily in unison into different angular positions independently of swinging of said frame, and driving connections between said shaft and said implements, said implements com prising respectively a disc-like body having an internally grooved edge flange, a backing disc of cushioning material fitted in said groove, and

an abrasive disc fitted in said groove on said backing disc.

5. In a machine of the class described, a motor 1 adapted to be mounted on a base and having an armature shaft, means to mount said motor on said base with said. shaft in. upright position, a yoke frame having a rear end straddling said motor and swingably mounted on opposite ends of said shaft, opposed pairs of disc-like abrading implements axially aligned in each pair, means to mount said pairs of elements on the outer end of said yoke frame forrotation in unison and adjustment bodily in unison into different angular positions independently of swinging of said frame, and driving connections between said shaft and said implements, said implements comprising re- 'spectively adisc-like body having an internally grooved edge flange, a backing disc of cushioning material fitted in said groove, and an abrasive disc fitted insaid groove on said baoking disc, said-abrasive disc having flattened edge portions, and pins extending through said flange and groove alongside said flattened portions to key the abrasive disc to said body. 

